Process of soldering chain-lines



1 "UNITED sTATEs PATENT OFFICE. v

EUGEN SPEIIDEL, OF PFORZHEIM, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

GENERAL CHAIN COMPANY, OF PROVIDENCE, RHODE ISLAND, A

MASSACHUSETTS.

CORPORATION OF PROCESS OF SOLDEBIN G CHAIN-LINKS. 1,308,741. speqiiiwflon of Rum Patent Patented July 1, 1914. Ho Drawing. Application filed February 28, 1912. Serial No. 679,428, I

To all whom it may concern:

Be it known that I EUGEN SPEIDEL, a subject of the German Emperor, and residing at Pforzheim, Germany, have invented certain new and useful Improvements in Processes of Soldering Chain-Links, of which the following is a specification.

The present invention has reference to the manufacture of ornamental or other metal chains from wire provided with a core of solder, and it relates more specifically to an improved process for preventing intersoldering of the links of such solder-cored chains.

[In my U. 8. Patent No. 1,017,818 I have described a process for soldering chain links of solder-cored wire, which essentially consists in applying .to the work piece an anti- -soldering, filmlike coating for the purpose of preventing intersolderin of the individual chain links. This antisolderin'g coating, as there described, entails the step of passin the work 'iece through acids, alkalis, c lorids, or t e like.

I, now, have found that it is possible to simplify and generally improve the described process by leaving out the step of specially treating the work piece in such baths, so that accordin to the present invention the chain is simp y cleansed of the deoxidizer in the well known manner and then fed directly to the soldering flame. The heat developed during the soldering operation, but previous to the fusin point of the solder core, will produce on t e surface of the work iece, except at the deoxidized faces of the oints, the oxid filmlike coating requisite to prevent the oozing solder from spreading onto adjacent par The metal alloy preferably used in this line of manufacture is copper-silver, and heating of the work piece in the presence of air or oxygen soon produces on its surface the desired oxid film in the form of copper oxid; If the chain or the like is passed throu h ozone, then black silver oxid is obtaine In carrying out my new .processI first treat the work iece, for instance a chain made upof interlinked rings, with any suitable soldering a cut, such as borax or the like; this deoxi izer is then removed from the surface of the links except at the joints by shaking, rubbing or brushing the chain point of the solder core the joints become shut in the well known manner.

Obviously there may be also an inde endent heating device ahead of the sol ering device proper, for heating the work piece to the temperature where the oxid compound is formed. Y

The soldered chain is then cleaned in elkali baths and by other means well known in the art, and. it is then passed on for further treatment.

What I claim is':-

1. Process of preventin intersoldering of solder-cored metal chain mks, consisting in applying a deoxidizer to the work piece, removing it again therefrom except at the oints, preheating the Work piece until oxidation takes place on the surface of the metal, and then heating the work piece to soldering heat, substantially as set forth.

2. Process of preventing intersoldering of solder-cored metal chain links, consisting in applying a deoxidizer to the work piece, removing it again therefromexcept at the joints, heating the work temperature, and then raising the heat until the core of solder melts and closes the joints, substantially as set forth.

3. Process of preventing intersoldering of solder-cored metal chain links, consisting in applying a deoxidizer to the work piece, removing it again therefrom except at the joints, heating the work piece in the presence of gaseous oxidizing agents, and then raising the heat to soldering temperature, substantially as set forth.

4. Process of 'preventin intersoldering of solder-cored metal chain llnks, consisting in applying a deoxidizer to the work piece, removing it again therefrom except at the joints, heating the work piece until a compound of the metal component of the shell of the links" is r'oduced on the surface of the links, and tlien c'ontinuin the heat to the fusing point of the sol er core, substantially as set forth.

5. In the method of automatically solderiece to oxidation .the links, removing the surplus coatin except from the joint surfaces, and

then 0 osing the oints by heating the chain with said joints so coated and the rest of its surface bare or uncoated with soldering salt.

7. A process of soldering chain made from solder wire, consisting in coating the chain with a soldering salt, removing coating except from the jolnt su aces of the the said ace-mi links, and then closing the joints with a soldering flame.

8. A process of soldering 'chain made from solder wire, consisting in coatin the joint surfaces of the links with a $01 eri-ng salt, 25s

removing the surplus soldering salt, and then closing the joints with a soldering flame.

In testimony whereof I aifix my signature in presence of two witnesses.

EUGEN SPEIDEL.

Witnesses:

A. O. TITTMANN, S. H. SHANK. 

